Club hammer & bolster/cold chisels; sometimes even a flat bladed garden spade will lift them quickly, depends on the quality of the adhesive used & how well they are stuck down; an SDS breaker with chisel attachment as a last resort.
After you’ve got the tiles up, if your left with a load of adhesive stuck to the ply which is difficult to get off or it's a mess your better off just ripping up the old ply & replacing it with new WBP.
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